sss per light output?

[kensonuken]

I want to make sss into each light pass.. can anybody help me on this...

[Wolfwood]

The easiest approach would be do to multiple render passes. Enable just one light, render, enable a different light, render. Then composite them all back together.

It is possible to use Light Exports, so you do just one render and then each light's contribution gets stored in the image as a Deep Raster. However the SSS shader in Houdini currently doesn't support Light Exports.

Edited December 14, 2008 by Wolfwood

[kensonuken]

I was looking for Henrik jensen`s shader? is there any rsl or vex source for that shader.....?

[Wolfwood]

I was looking for Henrik jensen`s shader? is there any rsl or vex source for that shader.....?

No, there isn't any freely available dipole based implementations that I am aware of.

[kensonuken]

I got this from 3delight... I think the same logic should work for H as well..

// sssLightID.sl by Iosif Kefalas aka Sifis. tested on 3Delight 8.0.1
surface 
sssLightID(    
                // DECLARE PARAMETERS
                #pragma annotation "grouping" "overall/overall_color;"
                #pragma annotation "grouping" "overall/overall_intensity;"
                color overall_color = 1;
                float overall_intensity = 1;
                #pragma annotation "grouping" "key/keyColor;"
                #pragma annotation "grouping" "key/key_intensity;"
                color keyColor = 1;
                float key_intensity = 1;
                #pragma annotation "grouping" "kick/kickColor;"
                #pragma annotation "grouping" "kick/kick_intensity;"
                color kickColor = 1;
                float kick_intensity = 1;
                #pragma annotation "grouping" "fill/fillColor;"
                #pragma annotation "grouping" "fill/fill_intensity;"
                color fillColor = 1;
                float fill_intensity = 1;

                // DECLARE OUTPUTS
                output varying color aov_sssLightID= 0;
                output varying color aov_sssLight_key= 0;
                output varying color aov_sssLight_kick= 0;
                output varying color aov_sssLight_fill= 0;)
{
    float luminance(color input_color){
        return
        0.3 * comp(input_color, 0) + 
        0.59 * comp(input_color, 1) + 
        0.11 * comp(input_color, 2);
    }
    uniform string raytype = "unknown"; 
    rayinfo("type", raytype);
    normal Nn = normalize(N);
    color keyLight = 0;
    color kickLight = 0;
    color fillLight = 0;
    uniform string category = "";

    // SEND TO SUBSURFACE EACH LIGHT CATEGORY SEPERATELY
    if(raytype == "subsurface"){
        illuminance(P, Nn, PI/2){
            vector Ln = normalize(L);
            float lightContrib = Nn.Ln * luminance(Cl);
            lightsource("__category", category);
            if (category == "key,specular,diffuse" || category == "key")
                setcomp(Ci, 0, lightContrib * key_intensity);
            else if (category == "kick,specular,diffuse" || category == "kick")
                setcomp(Ci, 1, lightContrib * kick_intensity);
            else if (category == "fill,specular,diffuse" || category == "fill")
                setcomp(Ci, 2, lightContrib * fill_intensity);
        }
        Ci *= overall_color * overall_intensity;
    }
    // GET COLOR FROM EACH LIGHT CATEGORY SEPERATELY
    else{
        illuminance(P, Nn, PI){
            lightsource("__category", category);
            if (category == "key,specular,diffuse" || category == "key")
                keyLight = Cl;
            else if (category == "kick,specular,diffuse" || category == "kick")
                kickLight = Cl;
            else if (category == "fill,specular,diffuse" || category == "fill")
                fillLight = Cl;
        }

    // RETURN FROM SUBSURFACE EACH LIGHT CATEGORY SEPERATELY
        color sssReturn = subsurface(P);
        aov_sssLightID = color(sssReturn[0], sssReturn[1], sssReturn[2]);
        aov_sssLight_key = color(sssReturn[0], sssReturn[0], sssReturn[0]) * keyLight * keyColor;
        aov_sssLight_kick = color(sssReturn[1], sssReturn[1], sssReturn[1]) * kickLight * kickColor;
        aov_sssLight_fill = color(sssReturn[2], sssReturn[2], sssReturn[2]) * fillLight * fillColor;
        Ci = aov_sssLight_key + aov_sssLight_kick + aov_sssLight_fill;
    }
}

[Jason]

I'm interested to see what you come up with Kensonuken. Have you managed to covert it?

ps. wrapping your code in CODEBOX /CODEBOX tags make it more readable. I'll do that for you now.

[kensonuken]

here is the modified code..

// sssLightID.sl by Iosif Kefalas aka Sifis. tested on 3Delight 8.0.1

surface 
sssLightID(    
                // DECLARE PARAMETERS
                #pragma annotation "grouping" "overall/overall_color;"
                #pragma annotation "grouping" "overall/overall_intensity;"
                color overall_color = 1;
                float overall_intensity = 1;
                #pragma annotation "grouping" "key/keyColor;"
                #pragma annotation "grouping" "key/key_intensity;"
                color keyColor = 1;
                float key_intensity = 1;
                #pragma annotation "grouping" "kick/kickColor;"
                #pragma annotation "grouping" "kick/kick_intensity;"
                color kickColor = 1;
                float kick_intensity = 1;
                #pragma annotation "grouping" "fill/fillColor;"
                #pragma annotation "grouping" "fill/fill_intensity;"
                color fillColor = 1;
                float fill_intensity = 1;

                // DECLARE OUTPUTS
                output varying color aov_sssLightID= 0;
                output varying color aov_sssLight_key= 0;
                output varying color aov_sssLight_kick= 0;
                output varying color aov_sssLight_fill= 0;)
{
    float luminance(color input_color){
        return
        0.3 * comp(input_color, 0) + 
        0.59 * comp(input_color, 1) + 
        0.11 * comp(input_color, 2);
    }
    uniform string raytype = "unknown"; 
    rayinfo("type", raytype);
    normal Nn = normalize(N);
    color keyLight = 0;
    color kickLight = 0;
    color fillLight = 0;
    uniform string category = "";

    // SEND TO SUBSURFACE EACH LIGHT CATEGORY SEPERATELY
    if(raytype == "subsurface"){
        illuminance(P, Nn, PI/2){
            vector Ln = normalize(L);
            float lightContrib = Nn.Ln * luminance(Cl);
            lightsource("__category", category);
            if (category == "key,specular,diffuse" || category == "key")
                setcomp(Ci, 0, lightContrib * key_intensity);
            else if (category == "kick,specular,diffuse" || category == "kick")
                setcomp(Ci, 1, lightContrib * kick_intensity);
            else if (category == "fill,specular,diffuse" || category == "fill")
                setcomp(Ci, 2, lightContrib * fill_intensity);
        }
        Ci *= overall_color * overall_intensity;
    }
    // GET COLOR FROM EACH LIGHT CATEGORY SEPERATELY
    else{
    // RETURN FROM SUBSURFACE EACH LIGHT CATEGORY SEPERATELY
        color sssReturn = subsurface(P);
        aov_sssLightID = color(sssReturn[0], sssReturn[1], sssReturn[2]);
        aov_sssLight_key = color(sssReturn[0]) * keyColor;
        aov_sssLight_kick = color(sssReturn[1]) * kickColor;
        aov_sssLight_fill = color(sssReturn[2]) * fillColor;
        Ci = aov_sssLight_key + aov_sssLight_kick + aov_sssLight_fill;
    }
}

Edited December 15, 2008 by kensonuken

[kensonuken]

But It renders only in three images in three channels....

I think we need to have that complete code with Illum loop to solve this..